Can someone explain Why “KeyboardSelectionPolicy” of Button CellList make the CellList page jump around when clicking on a cell (GWT)?

I got this code:

    ButtonCell buttonCell=new ButtonCell();      CellList<String> cellList = new CellList<String>(buttonCell);      ListDataProvider<String> cellListDataProvider = new ListDataProvider<String>();      List<String> data = cellListDataProvider.getList();      for (int i = 1; i < 12; i++) {          data.add( String.valueOf(i));      }      cellListDataProvider.addDataDisplay(cellList);      SimplePager pager=new SimplePager();      pager.setDisplay(cellList);      pager.setPageSize(3);  

When clicking on a cell in a page in CellList, it will jump to another page. If I use TextCell, then there is no problem.

Someone told me the issue is due to DefaultKeyboardSelectionHandler.Check execution of that handler. I can fix the issue by disabling KeyboardSelectionPolicy of the CellList.

cellList.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.DISABLED);  

If we do like that then it works, but:

• I don't understand why we have to do that?
• If I do that then "will it create any unexpected behavior for ButtonCellList"?

Also (http://stackoverflow.com/questions/22678779/can-someone-explain-why-keyboardselectionpolicy-of-button-celllist-make-the-ce)

 

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